Excuse me, teachers, is welding titanium harmful to human body? What's the harm

Harm of welding ... welding arc will be harmful to human body when welding. Welding arc mainly includes infrared light, visible light and ultraviolet light. These all belong to the hotline spectrum. When the welding arc temperature is 3000℃, its radiation wavelength is less than 290 μ m; Micron; When the temperature is 3200℃, its radiation wavelength is less than 230 μm μm When light radiation acts on human body, tissues in the body will be absorbed, causing thermal, photochemical or ionization effects of tissues and causing acute or chronic damage to human tissues. The harm of infrared rays to human body is mainly caused by the thermal effect of tissues. In the welding process, when the eyes are exposed to intense infrared radiation, they will immediately feel intense burns and burning pain, and flash hallucinations will occur. Long-term exposure may lead to infrared cataracts, decreased vision and even blindness in severe cases. The luminosity of visible light is about 10,000 times higher than that normally received by naked eyes. When visible light shines on people's eyes, it will cause pain and make people unable to see clearly, which is usually called "dizziness" and lose their ability to work in a short time. The harm of ultraviolet rays to human body is mainly photochemical action, which causes harm to human skin and eyes. After the skin is irradiated by strong ultraviolet rays, it can cause dermatitis, diffuse erythema, sometimes blisters and exudates, burning and itching; When the effect is strong, it is accompanied by systemic symptoms: headache, dizziness, fatigue, nervous excitement, fever, insomnia and so on. Overexposure of ultraviolet rays to human eyes can cause acute cornea and conjunctivitis, that is, electro-optic ophthalmia. Most patients developed symptoms 4- 12 days after irradiation. The symptoms were high shame, tears, foreign body sensation, tingling, eyelid swelling and spasm, accompanied by headache and blurred vision. In order to prevent the harm of electric welding arc to human body, work clothes, gloves and shoe covers with flat surface and high reflection coefficient must be worn when welding. Welders are not allowed to roll up their cuffs or wear short sleeves and open collars for welding work. After putting on work pants, make sure that you squat long enough to avoid exposing your ankles and being burned by arc light. Masks with special filter lenses must be used, and the filter lenses must be qualified products produced by factories designated by the state. Ordinary ink lenses are not allowed to be used at will. In order to protect the eyes of other workers in the welding area from injury, a barrier should be set up at the welding site. In the obstacle area, welding workers should always remind other workers to avoid obstacles. Conditional units can provide protective glasses for other workers in the welding area. In order to avoid the harm of arc light to eyes, argon arc welding is generally used in ........................................................... 1. Harmful factors of argon arc welding There are three kinds of harmful factors affecting human body: (1) Thorium in radioactive thorium-tungsten electrode is a radioactive element, but the radiation dose of thorium-tungsten electrode in argon arc welding is very small, which is within the allowable range and has little harm. If radioactive gas or particles enter the human body as radioactive sources in the body, it will seriously affect the health of the body. (2) When the high-frequency electromagnetic field is ignited by high frequency, the intensity of the high-frequency electromagnetic field is between 60 ~ 1 10V/m, which is several times higher than the reference hygienic standard (20V/m). However, due to the short time, it has little impact on the human body. If the arc is started frequently, or the high-frequency oscillator is used continuously as the arc stabilizer during welding, the high-frequency electromagnetic field can become one of the harmful factors. (3) When harmful gases such as ozone and nitrogen oxides are used in argon arc welding, the arc column temperature is high. The intensity of ultraviolet radiation is much greater than that of ordinary arc welding, so a lot of ozone and nitrogen oxides will be produced in the welding process; In particular, the concentration of ozone far exceeds the reference health standard. If effective ventilation measures are not taken, these gases have great influence on human health and are the most important harmful factors in argon arc welding.